Reconfigurable near-infrared optical filter with a micromechanical diffractive Fresnel lens

Author

Lacolle, Matthieu ; Sagberg, Håkon ; Johansen, Ib-Rune ; Løvhaugen, Odd ; Solgaard, Olav ; Sudbø, Aasmund S.

Author_Institution

Dept. of Phys., Univ. of Oslo, Norway

Volume

17

Issue

12

fYear

2005

Firstpage

2622

Lastpage

2624

Abstract

We have fabricated and characterized a micromechanical Fresnel lens that serves as a reconfigurable filter for near-infrared spectrometry, for the analysis of gas, liquids, or solids. The lens consists of silicon segments that can be individually actuated. Moving the segments vertically controls the spectrum of the light that is focused on a detector. The holographic pattern on top of the segments permits both focusing of the light and spectral control. We have demonstrated experimentally the desired spectral control of the filter.

Keywords

Fresnel diffraction; holographic gratings; integrated optics; microactuators; microlenses; optical design techniques; optical filters; optical focusing; optical variables control; silicon; diffractive Fresnel lens; holographic pattern; lens actuation; light focusing; micromechanical lens; near-infrared optical filter; near-infrared spectrometry; reconfigurable optical filter; silicon segments; spectral control; Holography; Lenses; Lighting control; Liquids; Micromechanical devices; Optical diffraction; Optical filters; Silicon; Solids; Spectroscopy; Focusing; gratings; microelectromechanical devices; optical diffraction; optical filters; spectroscopy;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.859186

Filename

1542169